Question

对于我的计算机科学课，我正在制作一个网站用户名/密码程序。我决定使用2D字符串数组，它还没有发挥出最佳效果。我试图让文件阅读器读取写入的登录但我不断收到ArrayIndexOutOfBoundsException错误。我的文件阅读器代码如下，还包括我的登录输入代码。我刚刚开始Java，所以我有非常基本的编程知识。

private void fileReader() throws FileNotFoundException {

    File inFile = new File(filePath);


    try {

        Scanner freader = new Scanner(inFile);

        while (freader.hasNextLine()) {

            for (int j = 1; j <= pass.length; j++) {

                pass[j][0] = freader.nextLine();

                pass[j][1] = freader.nextLine();

                pass[j][2] = freader.nextLine();

            }
        }

        freader.close();

    } catch (IOException e) {

        System.err.println(e);
        System.exit(1);

    }

登录输入：

private void input() throws InterruptedException, FileNotFoundException {



    for (int i = 0; i < pass.length; i ++){

            System.out.println(i);

            if (i == pass.length){
                add();
            }

            c.print("Please enter the website: ");

            pass[i][0] = c.readLine();

            c.print("Please enter your username: ");

            pass[i][1] = c.readLine();

            c.print("Please enter your password: ");

            pass[i][2] = c.readLine();

            while (true){

                c.clear();
                    synchronized (c) {
                        c.println("To continue adding logins, press C. To exit the program press ESC.");
                        c.println(pass[i][0] + " " +  pass[i][1] + " " +  pass[i][2]);
                    }
                if (c.isKeyDown(KeyEvent.VK_C)){
                    break;
                }
                else if (c.isKeyDown(KeyEvent.VK_ESCAPE)){
                    fileWriter();
                    pass();
                }

                Thread.sleep(10);

            }

    }




}

非常感谢任何帮助!!谢谢！

Answer 1

主要原因是因为：

for (int j = 1; j <= pass.length; j++) { pass[j][0] = freader.nextLine(); pass[j][1] = freader.nextLine(); pass[j][2] = freader.nextLine(); }

数组从0开始。通过使j = 1，您从组中的第二个数组开始，您需要从0开始并读取但不包括数组长度。

2D阵列文件阅读器

1 个答案: